I think it’s because of HDMI the values aren’t whole.

DisplayPort would display whole numbers

Indeed.

Some developers don’t want to deal with building an app for multiple versions. Sure some DEBs can work without needing to deal with that, but some don’t.

I’m done with Windows myself. The only time I ever touch it is for work when I gave to deal with some of our VMs for Photoshop users

Same for me. I may have the ability to use GPU pass-through, but if I’m not willing to heat up my room, I use my VM with Lubuntu.

Probably cuz Flatpak apps are all GUI apps and are harder compared to CLI apps?

Can’t wait for me to fully utilize the refresh rate of my ultrawide without it being limited by my 4K monitor

Isn’t it the same for Flatpak?